Heater Blower delete in 3.2

[PeterSW]

Hi, I'm wishing to remove my engine heater blower which no longer works, I'm sure I could get it running but I like the cleaner look in the engine bay.

My car - 1984 3.2 - is running on standard heat exchangers (cant afford SSI's/full back-date !) , I realise I need to run a hose from the fan shroud, over/round the distributer and into the exchanger system. The problem is the so called "Hot Air Socket Assembly" which fits into the shroud but directs air up and backwards - and is not suitable for alteration.

Has anyone managed to do this mod on a 3.2 ? I know the 3.6's which appear to have a different shroud can be modified

Thanks

Pete.

I've include Masraum's picture of the problem - Thanks to Steve

[89911]

Wouldn't be easier to just get a new/used blower? I understand the move to make it neater and simplier, but I wonder how much air is going to be moved through you system. I have backdated diffusers on both side feeding into SSI's. The heat is great only when the engine is moderately reving. If I cut the output in half such as what your suggesting, your low idle heat would be nonexistant. Depends on where you live and how you drive I suppose.

[Rot 911]

Peter, I am backdating my exhaust to SSI's and using the pre '74 engine tin and fan housing tin. The left side fan housing tin needs to be massaged a bit to fit around the distributor. I haven't done that yet. I am keeping the footwell blowers to get heat at idle. There are a number of people selling the engine and fan housing tin. If you just want to replace the engine blower motor, let me know. I'll sell you mine cheap.

[v9ff]

I thought about doing exactly what you propose to my heater blower when it wasn't working... but through the advice of this board I got a used one for $60 and it works great now.

The key reason why I did not proceed with the blower delete is because the engine blower is essential to the engine cooling system. It blows are down into the heat exchanges to "move the hot air" away from the engine thus improving cooling. This is one of the main parts of the 3.2 engine.

[KTL]

One thing to keep in mind if you remove the blower motor and reinstall proper shrouding. The footwell blower motors will not work. When you break the circuit at the blower motor atop the engine, the circuit is also open at the footwell motors.

You have to do some basic custom wiring to complete the circuit for the footwell blower. Nothing difficult. Just some connections to be made at the empty two wire harness that's vacated when you disconnect the blower motor.

I think removing the blower motor and it's associated tubing actually helps cool the engine better. Why?

The 911's 11 blade cooling fan is the major part in cooling the motor. The blower assy. steals cooling fan air that would normally be pushed across the cyls. and cyl. heads. This cooling air is more effective at cooling the engine than if you push this air through the heat exchangers. When you push this air through the exchangers and you have the heating system off (no heat coming into the car to keep you warm), this air is dumped out of the heater boxes/valves. So it's basically wasted cooling air in my opinion. But, some has to be wasted if you want to be warm inside the car. Sure, there's a little heat transfer going on when the air passes thru the exchangers. But I think the air would be better utilized if not stolen from the main 11 blade cooling fan.

If you don't need heat? Ditch the blower assy. for a cooler running engine.

[addictionMS]

not sure where you got the idea that the blower was part of the cooling, it is not. the blower is only tuned on when the heater leavers are pulled up, and is off when the heater is not turned on. So if you think about it, the blower is only on when cooling for the motor is least needed, on cold days.

I have looked into replacing my fan with a older block off and then jsut stepping up the hose size to fit the heat exchangers on the stock 3.2 exhaust

Jim

[Rot 911]

Actually there is a sensor in the crankcase breather housing that switches on the engine blower if the engine is hot enough, even when the engine is turned off. On the other hand, mine never came on so I am not sure how well the sensor works.

[KTL]

Originally posted by addictionMS
...............the blower is only tuned on when the heater leavers are pulled up, and is off when the heater is not turned on. So if you think about it, the blower is only on when cooling for the motor is least needed, on cold days..............

Jim

Exactly. And when the blower is off, there's still cooling fan air routed thru that plastic tubing that is eventually dumped out of the heater valves and somewhat wasted.

[bkrygier]

I am also removing my fan and am having a hard time locating pre 74 engine tin . I could sure use some help findin g these parts
thanks
bk

[3.2 CAB]

If anyone has a good 3.2 fan they are deleting, let me know.

[masraum]

Check out this thread for a way to get a new fan motor for $25

Carrera replacement heater blower (long)

other related threads

http://forums.pelicanparts.com/search.php?action=showresults&searchid=553736&sortby=lastpost&sortorder=descending

[Jeff Alton]

Is there someone here who has done this to a 3.2 and describe in detail the witing changes to keep the footwell blowers working.

Kurt, are you using the stock HE crossover pipe and only the drivers side block off plate?

Let us know how much heat you get when it is all done.

Thanks, Jeff

[Rot 911]

Originally posted by catca
Kurt, are you using the stock HE crossover pipe and only the drivers side block off plate?

Let us know how much heat you get when it is all done.

Thanks, Jeff

No I am doing a complete backdate to the way the heat was set up pre 1974, except I am keeping the footwell blowers.

[89911]

I've done my change over a year ago and don't have any footwell blowers. Can't say I really miss them. The SSI's and the backdated heaters will roast you if they are on full blast. The defrosters work fine also with plenty of hot air. What exactly do the footwell heaters do?

[v9ff]

This may be one of those debatable issues... I was advised to keep the blower motor on my 3.2 IF I had standard heat exchangers.

Here is the thread with that advice:
Engine heater blower delete options

So is the engine heater blower part of the 3.2 cooling systems through the heat exchangers?

[v9ff]

So what is the truth about the stock 3.2 heater blower removal?

[Rot 911]

If you aren't using it, just take the damn thing out. Think about it for a minute, 99.9% of the time the only time the blower is on is when you turn it on to use for heat. The rest of the time it doesn't turn on so how can it help for cooling when the engine is running? Like I stated previously there is a sensor in the crankcase breather that will kick the fan on if there is an overly high temperature when the engine is shut off. I have no idea what that temperature is as mine has never kicked in. I'm taking mine off and not reinstalling it after my rebuild.

[KTL]

I have to disagree that the motor is a cooling aid.

I think it is a heating aid for the cabin. That is, the blower motor assists in pushing the heated air into the passenger compartment for better heat production.

And like Jim (addictionMS) and Kurt said, when the motor is actually on is at a time when the engine needs cooling assistance the least- it's cold outside!

When the blower motor is off (and is obviously doing no work), the motor is providing zero assistance in pushing the air through the heat exchangers. It is the engine cooling fan that is pushing the air through that tubing and drawing heat off the exhaust plumbing.

The guys using SSI's eliminate this blower motor and they are not overheating and blowing engines left and right. The SSI's are no different than the standard 3.0 & 3.2 units in the sense of being heat exchangers. You can see that 89911/Mike's car in the link you posted doesn't have the blower in his system. He tracks his car pretty well from what i've seen.

[Colby]

>Is there someone here who has done this to a 3.2 and describe >in detail the witing changes to keep the footwell blowers >working.


Speaking from actual experience, I have done this. I have an '84 Cab and installed SSI's, converted over to early style heat ducts, eliminated the heater blower and all the fuses, etc. associated with them (in the driver side rear engine bay...all that can come out), and wired my footwell blowers so they will turn on by the knob. I basically just checked to see which wire needed to see current for them to work and ran an ignition on wire to it. I am not sure what color wire it was, but can check later.

The end result is perfect. Mild heat I pull up the levers and get heat from the engine fan blowing in heat. At idle, or for extra heat, I turn on the footwell motors.

Colby

[Jeff Alton]

Thanks for the help guys.

Cheers, Jeff